JPH07193421A - Compact antenna for portable radio equipment - Google Patents

Abstract

PURPOSE:To obtain an antenna for a compact portable terminal whose dimension is less than 1/4 of a used radio wavelength, realizing the excellent impedance matching with the high frequency part of a radio equipment. CONSTITUTION:On a finite ground 3 formed by a portable radio equipment body, a wire conductor 5 presenting a step-wise structure having the part in parallel to the finite ground 3 is fed as an antenna. A wire conductor which is close to the wire conductor 5 having the step-wise structure and has the part in parallel to one or plural other finite grounds 3 is placed on the finite ground in electrical contact with or in non-contact with the ground. As a result, because an antenna realizing the excellent matching with the impedance of a radio part can be realized with small volume and without a resonance part storing large reactive power, a compact antenna or an incorporated antenna to be applied to a compact portable radio equipment can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna applied to a small mobile terminal such as a mobile mobile terminal whose terminal size is less than 1/4 of a used radio wavelength.

[0002]

2. Description of the Related Art With a small antenna or a built-in antenna applied to a small terminal having a small volume such as a portable mobile terminal, impedance matching with a radio frequency unit becomes difficult due to the miniaturization and built-in of the antenna. Various measures are needed. In the prior art, the miniaturization is achieved on the basis of the linear / planar inverted F-shaped antenna, which is excellent in miniaturization and incorporation. For details, for example, Japanese Examined Patent Publication No. 2-22563,
It is discussed in Japanese Patent Publication No. 2-21164.

[0003]

The above-mentioned conventional techniques use an inverted F-shaped antenna, which essentially exhibits a capacitive characteristic, and a matching pin (short-circuit pin), which is provided near the feeding point and exhibits an inductive characteristic. To be consistent. However, as the size of the antenna is reduced, the capacity of the inverted F-shaped antenna is increased, and it is necessary to bring the position of the matching pin extremely close to the feed line in order to strongly reflect the inductive effect of the matching pin on the impedance characteristic of the antenna. There is. In this case, the matching pin and the feed line that represents the capacitance of the inverted F-shaped antenna form a resonance part having an extremely high Q, and the reactive power accumulated in this part significantly increases. Alternatively, the loss of the matching pin becomes large and the antenna efficiency is poor, and there is a problem to solve this.

[0004]

The above-mentioned object is to feed a linear conductor having a stepped structure having a portion parallel to the finite ground formed on a finite ground formed of a portable radio device housing as an antenna. In addition, a linear conductor having a portion parallel to the other finite ground or a plurality of finite grounds adjacent to the linear conductor having a substantially staircase structure may be electrically contacted or non-contacted with the finite ground shape. It is settled by being attached to.

[0005]

The portion of the linear conductor having the step-like structure parallel to the finite ground is an antenna and forms a kind of capacitor with the finite ground, which causes the capacitance of the inverted F antenna. However, from a different point of view, the portion of the linear conductor parallel to the finite ground is considered to be a high-impedance line formed on the finite ground. Therefore, in order to realize matching with the impedance of the radio part, a line having an impedance between the radio part impedance, which is usually low impedance of 50Ω, and the high impedance of the part of the linear conductor parallel to the finite ground. May be formed between the wireless portion, that is, the power feeding portion and the portion of the linear conductor that is parallel to the finite ground. Since the impedance of the line formed on the finite ground is proportional to the distance between the finite ground and the line, the impedance between the radio part impedance and the high impedance of the part of the linear conductor parallel to the finite ground. Is realized by forming a linear conductor in parallel with the finite ground at a height lower than that of the original linear conductor formed on the finite ground. Therefore, a linear conductor extends perpendicularly to the ground from a point extremely close to a point on the finite large ground such as a casing, then the linear conductor extends parallel to the ground, and then vertically to the ground. The linear conductor extends again, and then the stepped conductor in which the linear conductor extends in parallel to the ground is operated as an antenna to achieve good matching with the impedance of the radio section without a resonance section that accumulates large reactive power. A small antenna can be realized. The one or more conductors installed in addition to the stepped conductors ensure the diversification of the path of the high-frequency current from the feeding point to the radiation to the free space, and the impedance of the antenna and the radio unit is It has the effect of increasing the frequency range that is kept well.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention. A stepped conductor 5 having two steps is connected to a feeding point 4 on a finite ground 3 corresponding to a part of a wireless housing or a circuit board. Step conductor 5
First extends perpendicularly to the finite ground from the connection point and then
It has a structure that extends parallel to the finite ground, extends again perpendicularly to the finite ground, and extends parallel to the finite ground. The unbalanced line 2 electrically connects the outer conductor to the ground 3 on the back surface of the finite ground 3 or the surface where the stepped conductor 5 does not exist, and electrically connects the excitation power source 1 and the feeding point 4 via the inner conductor. Are bound to.

When viewed from the feeding point 4, the stepped conductor portion extending in parallel with the finite ground, which corresponds to the second step, operates as an antenna and also as a line having a high impedance with respect to the finite ground. This second stage part and low 5
The impedance as a line of the portion of the stepped conductor that is electrically connected to the feeding point having an impedance of 0Ω and is parallel to the finite ground, which is the first step as seen from the feeding point, is the feeding point. It has an intermediate value between the impedance of the point and the impedance of the portion of the stepped conductor, which corresponds to the second step and extends parallel to the finite ground, as viewed from the feeding point.
Therefore, the antenna of this embodiment can achieve a good matching state with the radio frequency unit of the radio at the feeding point.

Further, in this embodiment, since the two linear conductors do not have a portion in which the two linear conductors are placed close to and parallel to each other in the structure, an effect of solving the problem of deterioration of antenna efficiency due to reactive power accumulation is also obtained. Have.

FIG. 2 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The difference from FIG. 1 is that the stepped conductor 6 has multiple stages until it has a third stage. The part that extends parallel to the finite ground 3 of each step is
When considered as a line, the value of the characteristic impedance is proportional to the distance from the finite ground 3, so that the impedance gradually increases from the feeding point 4. For this reason,
A sudden change in impedance of each part in the antenna structure is suppressed as compared with the configuration of FIG. Therefore, there is an effect of suppressing a rapid change in impedance with respect to the frequency at the feeding point portion.

FIG. 3 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The point different from FIG. 1 is that, apart from the stepped conductor 5, it extends parallel to the finite ground of the stepped conductor in parallel and without electrical contact, and extends in parallel with the finite ground 3. The conductor 7 of FIG. By the time the energy supplied from the feeding point 4 to the antenna is released into the free space, it moves on the conductor as an induced current, but since the step conductor 5 and the second conductor 7 are installed close to each other. , Its energy can move between them in the form of displacement current. For this reason,
The path of energy transfer from the feeding point to the free space is diversified, the change in impedance with respect to the frequency at the feeding point is suppressed, and as a result, a good impedance matching condition between the radio frequency unit and the antenna is satisfied. This has the effect of increasing the frequency band to be used.

FIG. 4 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The point different from FIG. 3 is that, apart from the stepped conductor 5, it extends in parallel to the part of the stepped conductor 5 parallel to the finite ground 3 and in proximity without making electrical contact with the finite ground 3. That is, one end of the second conductor 7 is replaced with another second conductor 8 having a shape electrically coupled with a conductor perpendicular to the finite ground 5. Since one end of the second conductor 8 is electrically short-circuited and the other end is electrically open, the energy of the current is higher than that of the second conductor 7 of FIG. 3 in which both ends are open. When converting into the energy of the radio wave, the necessary resonance condition can be realized with a shorter length of about 1/4 wavelength, which is effective in reducing the antenna volume.

FIG. 5 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The point different from FIG. 4 is that, apart from the stepped conductor 5, the part of the stepped conductor 5 that is parallel to the finite ground 3 is close to the finite ground 3 without making electrical contact, and extends parallel to the finite ground. In addition to the second conductor 8, a third conductor 9 extending in parallel to the second conductor 8 without making electrical contact and in parallel with the finite ground 3 is provided. As compared with the case of FIG. 4, the path of energy transfer from the feeding point to the free space is further diversified, the change of impedance with respect to the frequency of the feeding point is suppressed, and as a result, between the radio frequency unit and the antenna. Therefore, there is an effect of further increasing the frequency band in which the favorable impedance matching condition is satisfied.

FIG. 6 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention, and FIG. 7 is a Smith diagram showing the frequency characteristic of its input impedance.

A difference from the configuration of FIG. 5 is that a plurality of third conductors 9 are provided. Compared to the case of Fig. 5, the path of energy transfer from the feeding point to the free space is further diversified, and the frequency band in which a good impedance matching condition is satisfied between the radio frequency unit and the antenna is significantly increased. To do. As shown in FIG. 7, a good matching state of VSWR <2 is realized at the frequency from point a to point b in the figure, and the volume is 0.18 wavelength / 0.025 wavelength / 0.02 wavelength. A matching band of 2.5% is realized.

FIG. 8 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 1 is different from FIG. 1 in that the conductor 5 is connected to one end of the conductor 5 which is different from the feeding point 4 and a conductor perpendicular to the finite ground 3 is not electrically contacted with the finite ground 3. Conductor 10
It was replaced by. Compared to the case of Fig. 1, by adjusting the length of the conductor perpendicular to this finite ground,
Since the impedance of the feeding point portion can be finely adjusted, there is an effect that it is possible to easily compensate for performance variations when applying this embodiment to a product.

FIG. 9 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 4 is different from FIG. 4 in that the conductor 5 has a shape in which a conductor parallel to the finite ground is connected to one end different from the feeding point of the stepped conductor 5 without electrically contacting the finite ground. The second conductor 8 is connected to one end of the second conductor 8 which is not grounded to the finite ground, and a conductor parallel to the finite ground is connected to the finite ground without electrically contacting the finite ground. That is, the conductor 12 having a shape is replaced. As compared with the case of FIG. 4, the impedance of the feeding point can be finely adjusted by adjusting the length of the conductor perpendicular to the finite ground, so that the performance variation when applying the present embodiment to the product. Has an effect that can be easily compensated.

FIG. 10 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 4 is different from that in FIG. 4 in that the central axes of the linear conductors forming the stepped conductor 5 do not exist in the same plane, but intersect each other at an angle of 90 degrees, and in the semi-infinite plane that shares the edge line of the end. It is replaced by the conductor 13 having the shape existing in 1. Compared to the case of FIG. 4, in the present embodiment, the length of the antenna structure in the longitudinal direction can be reduced, and therefore, the effect of increasing the degree of freedom of arrangement in the housing when the antenna of the present embodiment is built in the housing is obtained. is there.

FIG. 11 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The difference from FIG. 1 is that the step-like conductor 5 and a second part extending parallel to the finite ground in parallel with the part of the step-like conductor parallel to the finite ground and without electrical contact. Instead of having the conductor 7, two similar second conductors are grounded, and one end thereof and one end different from the feeding point of the stepped conductor 5 are mutually connected by using a conductor parallel to the finite ground. The point is to provide the conductor 14 including a single staircase structure that is coupled and reaches the point that is an open end from the feeding point without branching. In the case of FIG. 1, when the length of the portion parallel to the finite ground, which is the second step, is large when viewed from the feeding point of the staircase structure, it is possible to reduce the antenna structure in the longitudinal direction using this embodiment. I can. Therefore, there is an effect of increasing the degree of freedom of arrangement inside the housing when the antenna is built into the housing.

FIG. 12 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 11 is different from the conductor 14 having a structure including a stepped conductor, and is parallel to a portion of the stepped conductor parallel to the finite ground in parallel and in proximity to the finite ground without making electrical contact. Another second conductor 8 having a shape in which one end of the second conductor extending in the vertical direction is electrically coupled with a conductor perpendicular to the finite ground.
It is to have. Based on the same principle as the explanation of FIG. 4, the path of energy transfer from the feeding point to the free space is diversified, and the frequency band where the good impedance matching condition is satisfied between the radio frequency unit and the antenna is further increased. Has the effect of

FIG. 13 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The difference from FIG. 4 is that the step-like conductor 5 and the second conductor 8 which are linear conductors are
That is, the step-like conductor 15 and the second conductor 16 each made of a strip conductor are replaced. The strip conductor is easier to press, such as bend and punch, than the linear conductor, and is effective in reducing the cost when the present embodiment is applied to a product.

FIG. 14 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The difference from FIG. 4 is that in the structure corresponding to the stepped conductor 5 and the second conductor 8, the portion parallel to the finite ground at the first stage as seen from the feeding point of the stepped conductor is the first dielectric body. The strip conductor 17b formed on the plate 20 is formed on the second dielectric plate 21 in a portion parallel to the second-stage finite ground as seen from the feeding point of the stepped conductor. The strip conductor 17b is formed, and the portion of the second conductor parallel to the finite ground is formed by the strip conductor 18 formed on the second dielectric plate 21, and one end of the strip conductor 17b is joined to the feeding point. Pin 1
9c, another end of the strip conductor 17b and one end of the strip conductor 17a are joined by a joining pin 19b, and one end of the strip conductor 18 is joined by a joining pin 19a. According to this embodiment, since the antenna structure can be realized by using the printing technique of the thin film conductor and the thick film conductor, it is effective in reducing the mass production cost when the product is applied.

FIG. 15 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 14 is different from FIG. 14 in that the strip conductors 17a, 17b and 18 are connected to the feeding point and the finite ground through holes 22a, 22b and 2.
It is to be realized in 2c. According to this embodiment, the antenna structure can be realized by a consistent manufacturing process using the thin film conductor / thick film conductor printing technology and the through-hole technology, thus further reducing the mass production cost when the product is applied.

FIG. 16 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. 14 is different from FIG. 14 in that the strip conductor 17b is the first dielectric sheet 2
3 and the dielectric sheet is a first dielectric plate 2
0, the strip conductors 17b and 18 are realized on the second dielectric sheet 24, and the dielectric sheet is adhered on the second dielectric plate 20.
According to the present embodiment, the printing technique of thin film conductors and thick film conductors used for forming the strip conductors becomes easier, and the effect of reducing the mass production cost when the product is applied is remarkable. Is fulfilled.

FIG. 16 is a perspective view of another embodiment of the small antenna for portable radio equipment according to the present invention. The difference from FIG. 4 is that for each of the stepped conductor 5 and the second conductor 8,
A plane-symmetric structure 26, 27 is newly added with the finite ground as a plane of symmetry, the finite ground is removed, and the stepped conductor 5 and its symmetrical structure 26 are excited at the point where the constitutive ground exists.
In order to balance the power supply, the second conductor 8 and its symmetrical structure 27 are electrically coupled to each other at the point where the constitutive ground existed.
According to the present embodiment, since the antenna can be balanced-fed, the present structure can be applied to a radio device in which power is supplied from the high frequency section through a balanced line.

[0025]

According to the present invention, an antenna that achieves good matching with the impedance of a radio unit can be realized in a small volume without a resonance unit that accumulates a large reactive power, and thus the present invention is applied to a small portable radio device. It is possible to provide a small antenna or a built-in antenna.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 2 is a perspective view of another embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 3 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 4 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 5 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 6 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 7 is a Smith diagram showing a matching state with a radio frequency unit, which is an example of electrical characteristics of a small antenna for a portable radio according to the present invention.

FIG. 8 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 9 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 10 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 11 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 12 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 13 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 14 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 15 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 16 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

[Explanation of symbols]

1: Excitation power supply, 2: Feed line, 3: Finite ground, 4: Feed point, 5: Step conductor, 6: Step conductor, 7: Second conductor, 8: Second conductor, 9: Third , 9a: third conductor, 9b: third conductor, 10: staircase conductor, 11: staircase conductor, 12: second conductor, 13: staircase conductor, 14:
Stepped conductor having a bent portion, 15: stepped strip conductor, 16: second strip conductor, 17a: strip conductor, 17b: strip conductor, 18: strip conductor, 19a: coupling pin, 19b: coupling pin, 19c: Coupling pins, 20: first dielectric plate, 21: second dielectric plate, 22a: through hole, 22b: through hole, 2
2c: through hole, 23: first dielectric sheet, 2
4: Second dielectric sheet, 25: symmetric structure of stepped conductor, 26: symmetric structure of second conductor.

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[Procedure amendment]

[Submission date] June 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 2 is a perspective view of another embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 3 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 4 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 5 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 6 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 7 is a Smith diagram showing a matching state with a radio frequency unit, which is an example of electrical characteristics of a small antenna for a mobile radio according to the present invention.

FIG. 8 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 9 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 10 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 11 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 12 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 13 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 14 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 15 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 16 is a perspective view of an embodiment of a small antenna for a portable wireless device according to the present invention.

FIG. 17 shows a small antenna for a portable wireless device according to the present invention.
The top view of one Example.

[Explanation of Codes] 1: Excitation power supply, 2: Feed line, 3: Finite ground, 4: Feed point, 5: Step conductor, 6: Step conductor, 7: Second conductor, 8: Second conductor , 9: third conductor, 9a: third conductor, 9b: third conductor, 10: step conductor, 11: step conductor, 12: second conductor, 13: step conductor, 14:
Stepped conductor having a bent portion, 15: stepped strip conductor, 16: second strip conductor, 17a: strip conductor, 17b: strip conductor, 18: strip conductor, 19a: coupling pin, 19b: coupling pin, 19c: Coupling pins, 20: first dielectric plate, 21: second dielectric plate, 22a: through hole, 22b: through hole, 2
2c: through hole, 23: first dielectric sheet, 2
4: Second dielectric sheet, 25: symmetric structure of stepped conductor, 26: symmetric structure of second conductor.

Claims (21)

[Claims] 1. A point on a finite large ground such as a casing of a wireless device, which does not make electrical contact with the center of a small hole having an opening of 1/100 or less of a wavelength used by the wireless device for communication. A linear conductor extends perpendicular to the ground, then the linear conductor extends parallel to the ground, then a linear conductor extends again perpendicular to the ground, and then a linear conductor extends parallel to the ground. The staircase conductor is fed with one end of the substantially staircase conductor existing in the opening surface of the small hole on the finite large ground as a feeding point, and the ground as the ground potential from the other surface of the ground where the staircase conductor does not exist. A small antenna for mobile wireless devices, characterized by being. 2. A small antenna for a portable radio device according to claim 1, wherein a coaxial line is used for power feeding, and an outer conductor of the coaxial line is provided on an opening surface of a small hole on a finite large ground such as a casing. It is grounded so as to include all, and the inner conductor of the coaxial line is connected to one end of the roughly stepped conductor existing on the opening surface of the small hole on the finite ground without contacting the outer ground, and is unbalanced. A small antenna for mobile wireless devices, which is characterized in that it is performed in its appearance. 3. A small-sized antenna for a portable wireless device according to claim 1, wherein the number of stepped conductors formed by sequentially bending the linear conductors is larger. For small antenna. 4. The small antenna for a portable wireless device according to claim 2, wherein the number of stepped conductors formed by sequentially bending the linear conductors is larger. For small antenna. 5. The small antenna for portable wireless device according to claim 1, wherein the stepped conductor is parallel to the stepped conductor and is parallel to the ground. A small antenna for a portable wireless device, comprising a second conductor which is electrically non-contact. 6. The small antenna for a portable wireless device according to claim 5, wherein the second conductor is one end thereof and the ground is a linear conductor formed perpendicular to the ground. A small antenna for a portable wireless device, which is electrically coupled. 7. A small antenna for portable radio equipment according to claim 5 or 6, further comprising a third conductor having the same or the same topological coupling relation as the second conductor. A small antenna for portable radios. 8. A small antenna for a portable wireless device according to claim 7, wherein not only the third conductor having the same or the same topological coupling relation as the second conductor, but also a plurality of more conductors. A small antenna for a portable wireless device, comprising the other conductor of 9. The small antenna for portable wireless device according to claim 5, wherein a portion of the stair-shaped conductor is most distant from the ground and has a parallel positional relationship. , The second, the second, or the third step, or the number of other conductors that do not make electrical contact with the plurality of stepped conductors, and the height of the portion parallel to the ground with respect to the ground is the same. A small antenna for mobile wireless devices. 10. The small antenna for portable wireless device according to claim 2, wherein one end of the stepped conductor which is not a feeding point is electrically contacted with the ground or another conductor. A small antenna for portable radios, characterized in that linear conductors are connected. 11. The small antenna for a portable wireless device according to claim 2, wherein one or a plurality of conductors different from the stepped conductor is not grounded to the ground. A small antenna for a portable wireless device, wherein a linear conductor that does not make electrical contact with the ground, the stepped conductor, or another conductor is coupled to one end. 12. A small antenna for a portable wireless device according to claim 5, wherein one end of the stepped conductor, which is not a feeding point, is grounded to the ground of a plurality of other conductors. A small antenna for a portable wireless device, wherein one end, which is not grounded to the ground, is electrically connected to a part or a plurality of parts by a linear conductor. 13. A small antenna for a portable wireless device according to any one of claims 1 to 12, wherein the conductor forming the stepped conductor is a strip-shaped conductor. Small antenna. 14. The small antenna for portable radio equipment according to claim 13, wherein one of the strip conductors can be realized by bending one strip conductor, and a part of the strip conductor can be realized. A small antenna for a portable wireless device, which shows a positional relationship parallel to the ground. 15. The small-sized antenna for a portable wireless device according to any one of claims 1 to 14, wherein the cross sections of the stepped conductors are formed on the same plane. For small antenna. 16. The small antenna for portable radio equipment according to claim 13 or 14, wherein the central axes of the strip-shaped conductors forming the stepped conductors are formed on the same plane. Small antenna for radio. 17. The small antenna for portable radio device according to claim 13, wherein a portion of the strip conductor forming the structure, which is parallel to the ground, is printed on a dielectric plate. It is realized by a plurality of printed patterns, and these are laminated, and a part perpendicular to the ground is realized by a coupling pin formed between the patterns on the substrate or between the pattern on the substrate and the ground. A small antenna for portable radios. 18. The small antenna for portable radio device according to claim 17, wherein the portion vertical to the ground is realized between patterns on the substrate or patterns on the substrate and through holes formed in the substrate. A small antenna for mobile radios, characterized by 19. The miniature antenna for a portable wireless device according to claim 17 or 18, wherein a plurality of prints in which a portion of the strip conductor forming the structure, which is parallel to the ground, is printed on a dielectric plate. A small antenna for a portable wireless device, which is realized by a printed pattern printed in the form of a thin film and a dielectric plate that adheres to and supports the upper surface of the printed pattern instead of the pattern. 20. A small antenna for a portable wireless device according to claim 18 or 19, wherein a dielectric substrate forming a structure,
Alternatively, a small antenna for a portable wireless device, characterized in that the dielectric plates have different permittivities. 21. The small antenna for portable wireless device according to claim 1, wherein the ground ground is used in place of the ground ground in a plane-symmetric position as a plane-symmetric reference plane. A small antenna for a portable wireless device, which is newly provided with the same structure, and is configured to perform parallel power feeding between a feeding point of a large stepped conductor and a feeding point of a newly provided symmetrical structure. .